Honda CR250R 2004 Owner's Manual page 35

4. SERVICE AND MAINTENANCE
Connecting Rod Inspection
Temporarily remove the shop towel.
Install the bearing and piston pin in the connecting rod
small end and check for excessive play while holding
the connecting rod.
If it feels loose, replace the piston pin and small end
bearing.
(1) PISTON PIN
Place the shop towel back in the crankcase.
Cylinder/Piston/Piston Pin/Piston Ring Inspection
We recommended you consult the Service Manual or
your authorized Honda dealer for correct Service Limit
measurements.
32
Piston Installtion
Clean the piston ring grooves.
Lubricate the piston rings and piston ring grooves with
clean 2-stroke oil.
Install the piston rings on the piston.
NOTE:
•
Install the piston rings with the "IT" marks facing
up.
Locate the piston ring end gaps on the pins in the
ring grooves.
Lubricate the small end bearing and piston pin with
clean 2-stroke oil.
Install the connecting rod small end bearing, piston
and piston pin.
NOTE:
•
Install the piston with the "IN" mark facing the
intake side.
Install the piston pin clips.
CAUTION:
•
Use new pin clips. Never reuse oil clips.
•
Do not let the clips fall into the crankcase.
(1) "IN" MARK (2) PISTON PIN CLIP
(3) RING MARKS
Cylinder Installation
Clean off any gasket material from the gasket surface of
the crankcase being careful not to let any material fall
into the crankcase.
NOTE:
•
Be careful not to remove any metal from the gasket
surface of the crankcase.
Remove the shop towel. Do not let any gasket debris
fall into the crankcase.
Place the cylinder base gasket and dowel pins on the
crankcase.
(1) GASKET (3) PISTON RING PINS
(2) DOWEL PINS
Align each ring end gap with the piston ring pins in the
ring grooves.